in boston, i'm stacey cohan reporting. >> federal agents are confirming that the f-b-i did interview the older brother, tamerlan tsarnaev in 2011, after being tipped off by a foreign government. the suspect identified himself as ethnic chechen from southern russia and officials there believed tamerlan was going to travel to the country's region to join unspecified underground groups. the fbi says it interviewed tsarnaev and relatives, and did not find any domestic or foreign terrorism activity. meanwhile, tsarnaev's uncle says he had a falling-out with the 26-year-old over his increased commitment to islam. as authorities continue to dig into the accused boston bomber's past. some are now connecting themmuslim leaders have condemned the attack. but as kron 4's mike pelton shows us, the bombing's have created a tense environment for many american muslims. how abimelech millions, kennet sh been watching >> it is a difficult line to walk because there want to focus on the victims and there is a concern and even dread. that we are hoping they are not moslem or that their of their connect